Detecting a μτ-philic Z' boson via photon initiated processes at the LHC

Abstract

Discrepancy between the measured value and the Standard Model prediction of the muon anomalous magnetic moment is a possible hint for new physics. A $Z^{\prime }$ particle with $\mu \tau$ flavor violating couplings can give a large contribution to the muon anomalous magnetic moment due to the $\tau$ mass enhancement at the one-loop level, and is known to explain the above discrepancy. In this paper, we study the potential of the Large Hadron Collider (LHC) for detecting such a $Z^{\prime }$ boson via the $pp\to {\mu }^{-}{\mu }^{-}{\tau }^{+}{\tau }^{+}$ process. Earlier studies in the literature only considered the production channel with quark initial states ($pp\to q\bar{q}\to {\mu }^{-}{\mu }^{-}{\tau }^{+}{\tau }^{+}$). Here, we show that the photon initiated process, $pp\to \gamma \gamma \to {\mu }^{-}{\mu }^{-}{\tau }^{+}{\tau }^{+}$, is in fact the dominant production mode, for a heavy $Z^{\prime }$ boson of mass greater than a few hundred GeV. The potential of the high luminosity (HL) LHC is also considered.

arXiv comment11 pages, 6 figures

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• Charged Lepton Flavor Violation at the High-Energy Colliders: Neutrino Mass Relevant Particles
• Search for the Z boson decay to $\tau \tau \mu \mu$ in proton-proton collisions at $\sqrt{s}$ = 13 TeV